Division 2 The main vocabulary is based on a tree structure comprising codes of up to nine digits associated with a wording that describes the supplies, works or services forming the subject of the contract.

The numerical code consists of 8 digits, subdivided as follows:

• the first two digits identify the divisions (XX000000-Y),

• the first three digits identify the groups (XXX00000-Y),

• the first four digits identify the classes (XXXX0000-Y),

• the first five digits identify the categories (XXXXX000-Y).

Each of the last three digits gives a greater degree of precision within each category.

A ninth digit serves to verify the previous digits.